LAN Design Query

[ahmad82pkn]

This might be a bad question, but i was just hoping to get some best option to work on.

in diagram attach you can see existing office in white and my new office in YELLOW color.

I have connected new YELLOW Office 2 core switches with existing 2 core switches on office 1.

New office will use existing bandwidth of current office.

my question is what is best way to connect both office CORE switches for 100% redundancy in case of link failure between core switches.

one option that come in my mind is make a layer 3 VLAN between all 4 core switches and run HSRP between them lets say

Vlan 192

Office 1 Core 1 IP = 192.168.1.2  

Office 1 Core 2 IP = 192.168.1.3

Office 1 HSRP IP = 192.168.1.1

Then

Yellow Office Core1 IP = 192.168.1.4

Yellow Office Core2 IP = 192.168.1.5

Yellow Office HSRP IP = 192.168.1.6

And then do routing on HSRP Gateway IP.

is it right way to go?

and what other options i have?

thanx in advance

[Reza Sharifi]

Between you 4 core routers you can simply use a routing protocol and that will provide redundency for you..

Run HSRP for your vlans and connect 4 core devices fully meshes. Use /30 (routed) for each segment.

Core 1 to to core 2 IP = 192.168.1.0/30  

Core 1 to to core 3 IP = 192.168.1.4/30  

Core 2 to to core 1 IP = 192.168.1.8/30  

Core 2 to to core 3 IP = 192.168.1.12/30  

Use OSPF for all your segments including the vlans.

HTH